Why doesn’t anybody know if Swachh Bharat Mission is succeeding?

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In 2014, the Prime Minister announced a goal of eliminating open defecation by 2019. In this article, Coffey and Spears, contend that now almost two-thirds of the way through the Swachh Bharat Mission, nobody knows whether it is succeeding because there is no credible, independent survey that can offer a useful estimate of the fraction of rural persons defecating in the open.